// Sticky Plugin v1.0.0 for jQuery
// =============
// Author: Anthony Garand
// Improvements by German M. Bravo (Kronuz) and Ruud Kamphuis (ruudk)
// Improvements by Leonardo C. Daronco (daronco)
// Created: 2/14/2011
// Date: 2/12/2012
// Website: http://labs.anthonygarand.com/sticky
// Description: Makes an element on the page stick on the screen as you scroll
//       It will only set the 'top' and 'position' of your element, you
//       might need to adjust the width in some cases.

(function($) {
    var defaults = {
        topSpacing: 0,
        bottomSpacing: 0,
        className: 'is-sticky',
        wrapperClassName: 'sticky-wrapper',
        center: false,
        getWidthFrom: '',
        callback: {}
    },
    $window = $(window),
            $document = $(document),
            sticked = [],
            windowHeight = $window.height(),
            scroller = function() {
        var scrollTop = $window.scrollTop(),
                documentHeight = $document.height(),
                dwh = documentHeight - windowHeight,
                extra = (scrollTop > dwh) ? dwh - scrollTop : 0;

        for (var i = 0; i < sticked.length; i++) {
            var s = sticked[i],
                    elementTop = s.stickyWrapper.offset().top,
                    etse = elementTop - s.topSpacing - extra;

            if (scrollTop <= etse) {
                if (s.currentTop !== null) {
                    s.stickyElement
                            .css('position', '')
                            .css('top', '');
                    s.stickyElement.parent().removeClass(s.className);
                    s.currentTop = null;
                    s.defaultCallback();
                }
            }
            else {
                var newTop = documentHeight - s.stickyElement.outerHeight()
                        - s.topSpacing - s.bottomSpacing - scrollTop - extra;
                if (newTop < 0) {
                    newTop = newTop + s.topSpacing;
                } else {
                    newTop = s.topSpacing;
                }
                if (s.currentTop != newTop) {
                    s.stickyElement
                            .css('position', 'fixed')
                            .css('top', newTop);

                    if (typeof s.getWidthFrom !== 'undefined') {
                        s.stickyElement.css('width', $(s.getWidthFrom).width());
                    }

                    s.stickyElement.parent().addClass(s.className);
                    s.currentTop = newTop;
                    s.callback();
                    console.log(s);
                    console.log(s.callback);

                }
            }
        }
    },
            resizer = function() {
        windowHeight = $window.height();
    },
            methods = {
        init: function(options) {
            var o = $.extend(defaults, options);
            return this.each(function() {
                var stickyElement = $(this);

                stickyId = stickyElement.attr('id');
                wrapper = $('<div></div>')
                        .attr('id', stickyId + '-sticky-wrapper')
                        .addClass(o.wrapperClassName);
                stickyElement.wrapAll(wrapper);

                if (o.center) {
                    stickyElement.parent().css({width: stickyElement.outerWidth(), marginLeft: "auto", marginRight: "auto"});
                }

                if (stickyElement.css("float") == "right") {
                    stickyElement.css({"float": "none"}).parent().css({"float": "right"});
                }

                var stickyWrapper = stickyElement.parent();
                stickyWrapper.css('height', stickyElement.outerHeight());
                sticked.push({
                    topSpacing: o.topSpacing,
                    bottomSpacing: o.bottomSpacing,
                    stickyElement: stickyElement,
                    currentTop: null,
                    stickyWrapper: stickyWrapper,
                    className: o.className,
                    getWidthFrom: o.getWidthFrom,
                    callback: o.callback,
                    defaultCallback: o.defaultCallback
                });
            });
        },
        update: scroller
    };

    // should be more efficient than using $window.scroll(scroller) and $window.resize(resizer):
    if (window.addEventListener) {
        window.addEventListener('scroll', scroller, false);
        window.addEventListener('resize', resizer, false);
    } else if (window.attachEvent) {
        window.attachEvent('onscroll', scroller);
        window.attachEvent('onresize', resizer);
    }

    $.fn.sticky = function(method) {
        if (methods[method]) {
            return methods[method].apply(this, Array.prototype.slice.call(arguments, 1));
        } else if (typeof method === 'object' || !method) {
            return methods.init.apply(this, arguments);
        } else {
            $.error('Method ' + method + ' does not exist on jQuery.sticky');
        }
    };
    $(function() {
        setTimeout(scroller, 0);
    });
})(jQuery);
